NEXON 3.0 EV DTC Troubleshooting Document for VCU Version: 2.0 Date: 22-Sep-2023 Copyright © TATA MOTORS Ltd. This document must not be used in anyway, such as copying and redistributing to third parties, without the consent of author. U0121 - 08: - Lost Communication with ABS module - Bus Signal / Message Failures Overview: ISO Code U0121 - 08 Customer Symptom Vehicle is drivable with reduced power with limp home tell-tale indication blinking on cluster. Also regeneration function can be affected Fault Effects (On Vehicle) Vehicle is drivable with vehicle speed will be limited to 50 kmph and regeneration function can be affected. Lamp Status (If Any) Limp home telltale blinking. Service Indicator telltale blinking Fault Detection Condition ABS CAN messages are not received at VECU Normal Operating Condition ABS CAN message is received at VECU for vehicle operation Probable Trouble Area LV wiring Harness ABS fuse Healing Condition Ignition OFF wait till VCU sleeps & Ignition ON Component Details: Anti-Lock Braking System (ABS) ECU processes information from wheel-speed sensors and the hydraulic brake system to determine when to release braking pressure at a wheel that's about to lock up and start skidding. Preliminary Checks: 1. Check for proper terminal connection of 12V LV Battery 2. Check LV Battery voltage to be in range (7.5V - 14V) 3. Check LV Supply Connection of ABS for damage (connectors, terminals bending & rusting of pins) 4. Check for loose connection of LV wiring harness between ABS and VCU
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